🐛 💄 better error handling. fix #70

pyexcel_io/io.py

@@ -190,7 +190,12 @@ def load_data(
         reader = READERS.get_a_plugin(file_type, library)
     except NoSupportingPluginFound:
         if file_name:
-            if not os.path.exists(file_name):
+            if os.path.exists(file_name):
+                if os.path.isfile(file_name):
+                    raise
+                else:
+                    raise IOError("%s is not a file" % file_name)
+            else:
                 raise IOError("%s does not exist" % file_name)
         else:
             raise

tests/test_io.py

@@ -15,6 +15,11 @@ from zipfile import BadZipfile
 PY2 = sys.version_info[0] == 2
 
 
+@raises(IOError)
+def test_directory_name_as_file():
+    get_data('/')
+
+
 def test_force_file_type():
     test_file = "force_file_type.txt"
     data = get_data(